Disclaimer : Cancellations within 24 hours are subject to a cancellation fee. After 24 hours, a higher fee will apply.

Unlock the full potential of your 2011-2018 Mercedes-Benz CLS500/CLS550 W218 with a GCA Performance ECU Tune, engineered to transform the way your vehicle responds, accelerates, and delivers power.

Designed with a performance-first approach, this custom ECU calibration optimizes your 4.7L V8 Twin Turbo M278 engine for sharper throttle response, stronger torque delivery, and a more aggressive powerband. From improved mid-range acceleration to stronger top-end performance, every aspect of your engine’s output is refined for a more exciting driving experience.

Unlike generic tuning solutions, GCA Performance tuning is tailored to your vehicle setup and fuel quality. Your factory ECU data is securely saved, allowing you to return your vehicle to the original factory calibration at any time.

Whether you are running factory components or upgraded GCA Performance downpipes, this tune provides the flexibility and performance gains needed to maximize your build.

We Stand Behind Our Products

• All items from us include a 1-Year Warranty!

Tuning Features

• Improved throttle response and acceleration
• Increased horsepower and torque output
• Optimized turbocharger performance
• Stronger and more consistent power delivery
• Octane-specific calibration based on fuel quality
• Enhanced exhaust sound with adjustable burble options
• Factory speed limiter removal
• Cold start behavior customization
• Downpipe readiness with check engine light suppression (for off-road use only)
• Fully reversible factory ECU restoration

Tuning Specifications

Fits:
2011 2012 2013 2014 2015 2016 2017 2018 W218/C218 Mercedes-Benz CLS500 CLS550 RWD & 4MATIC
Engine: 4.7L V8 Twin Turbo M278

Available Tuning Options:

• Stage 1: Factory Downpipes
• Stage 2: GCA Performance Downpipes

After purchase, tuning instructions will confirm which stage is required for your setup. Stage 2 tuning does not require an additional charge.

Performance Gains

• Horsepower Gain: +120 HP
• Torque Gain: +150 TQ

Installation & Tuning Process

• After purchase, tuning instructions will be sent via email
• Vehicle tuning is completed through a provided tuning cable
• Factory ECU settings are securely backed up before tuning
• Vehicle can be returned to stock settings at any time